Changing air quality is a bigger issue, but you can reduce your exposure.
Purifying the air we breathe requires regulation and a change in collective behavior on the part of major polluters. But on a day-to-day basis, you can certainly be smart about your level of exposure to bad air. And many of the precautions are just plain "common sense" measures, says Norman Edelman, chief medical officer of the American Lung Association. He and Robert Brook, a University of Michigan cardiologist who researches the health effects of air pollution, offer advice so you can breathe easier.